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arXiv · 2410.20394

Non-monotonic radiative heat transfer in the transition from far field to near field

Victor Guillemot·Riccardo Messina·Valentina Krachmalnicoff·Rémi Carminati·Philippe Ben-Abdallah·Wilfrid Poirier·Yannick De Wilde
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Abstract

We present high precision measurements of the radiative heat transfer of a glass microsphere immersed in a thermal bath in vacuum facing three different planar substrates (SiO2, SiC and Au), which exhibit very different optical behaviors in the infrared region. Using a thermoresistive probe on a cantilever, we show the nonmonotonic behavior of the radiative flux between the microsphere and its environment when the microsphere is brought closer to the substrate in the far-field to near-field transition regime. We demonstrate that this unexpected behavior is related to the singularities of dressed emission mechanisms in this three-body system sphere-substrate-bath with respect to the separation distance.

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Victor Guillemot, Riccardo Messina, Valentina Krachmalnicoff, Rémi Carminati, Philippe Ben-Abdallah, Wilfrid Poirier, Yannick De Wilde. 2024-10-27. Non-monotonic radiative heat transfer in the transition from far field to near field. https://doi.org/10.1103/physrevlett.134.193801

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